Firstly
to nthellworld Jez
The cable modem (and other ntl routing devices) have a private address which is unique within the ntl network only, these are allowed by "RFC 1918 Address Allocation for Private Internets February 1996"
Quote:
3. Private Address Space
The Internet Assigned Numbers Authority (IANA) has reserved the
following three blocks of the IP address space for private internets:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
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This is not your internet IP address which you find out from...
http://www.all-nettools.com/pr.htm
for example
NB many sites incorrectly quote the ntl proxy cache as your address, the cache changes depending on which size you check as each only handle a portion of the IP address space